Transposition bracket



y 2, 1956 w. G. MILNE ET AL 2,747,010

TRANSPOSITION BRACKET Filed Nov. 7. 1952 "l mm 6068/64 6 Prose-Er @C 4vv-amvex TRANSPOSITIGN BRACKET Winford G. Milne and Frederick G.Ridgers, Hamilton,

Gntario, Canada, assignors to N. Slater Company Liniited, Hamilton,Ontario, Canada Application November 7, 1952, Serial No. 319,216

2 Claims. (Cl. 174-453) This invention relates to a transpositionbracket.

As is known, a transposition bracket is used where one conductor of aline has to cross over the other conductor of the line. Each conductorthus subtends two angles at the transposition bracket. Whether thebracket is at a cross arm or at mid-span, the tension in each of theconductors causes a resultant bending moment on the pin supporting theinsulator to which the conductor is attached.

Thus, the insulator-supporting pins of one pair of insulators (say onone side of the cross arm) tend to bend one toward the other; likewise,the insulator-supporting pins of the other pair of insulators (on theother side of the cross arm) tend to bend one toward the other.

As a conductor sometimes bodily moves longitudinally, it is desirablethat the insulators, if of the pin type, which support the conductorsshould be free to rotate on their supporting pins; otherwise, oneinsulator screws itself tightly on its pin, while the other insulatorunscrews itself, a condition which may cause failure.

The objects of the invention, therefore, are to improve on knowntransposition brackets.

A specific object is to provide a transposition bracket in which pairsof insulator supports are connected together, respectively, theinsulator-supporting pins of each pair which tend to bend one toward theother being, in effect, rigidly connected one to the other.

Another specific object is to provide a transposition bracket in whichthe pairs of insulator supports are, in ettect, connected together bycomposite structures comprising a compression member and a tensionmember.

Another specific object is to provide a light, simple but sturdytransposition bracket.

Still another specific object is to provide a transposition bracket inwhich the insulators, in the form of spools, are freely rotatablysupported.

in the drawing, wherein like numerals of reference indicatecorresponding parts in the various figures- Figure l is a plan view of atransposition bracket made according to this invention;

Figure 2 is a side elevation of Figure l; and,

Figure 3 is an end view of Figure 1, as seen from right to left inFigure 1.

Referring now by numerals to the drawings, the bracket, designated as10, is shown as secured to a cross arm M as by bolts N.

The bracket assumes generally the form of an H as seen in plan,presenting laterally-spaced parallel arms 11 and 12 adapted to extend oneither side of the cross arm. In the form shown, the arms areconveniently connected together as by a transverse member 13,butt-welded to the arms. The member 13, through which the bolts Nextend, provides a supporting base.

The ends of both arms are curved upwardly and inwardly to present shortU-shaped portions 14 forming supports for the four spool type insulatorsA, B, C and D.

A portion of the arm 11 is bent as at 15 so as to ofiset the seat forthe insulator A upwardly with respect to the 1 nixted States Patentinsulator C. In other words, the seat of the insulator A is at a higherlevel than that of the insulator C. Likewise, the arm 12 is ottset as at15 so as to position the insulator D higher than the insulator C. Botharms are thus similarly formed so that the mating insulators A and D areat the same level, and the mating insulators B and C are also at thesame level.

The mating insulators A and B are rotatably mounted to their respectivearms 11 and 12 by a skewed or distorted U-shaped member 18. The parallellegs 19 of the member 18 pass through holes in the arms and serve asjournals around which the insulators freely rotate.

The insulators are held in operative position to the member 18, moreparticularly to the legs 19, as by washers 20 and cotter pins 21.

Resting on the portions or seats 14 of the arms, and connecting the legs19 of the U-shaped member 18, is a rod 24. Conveniently, the rod isconnected to the two legs by flattening its ends and providing holesthrough which the legs 19 pass. The connection or rod 24 thus forms astrut or compression member, since the insulators A and B tend to bedisplaced bodily one toward the other. The strut, acting in compression,thus substantially prevents the bodily displacement of one insulatortoward the other.

As the thrust or force tending bodily to displace the insulators A and Btoward one another is imposed upon the insulators above the axis of thestrut, the ends 14 of the arms are subjected to a torsional efiort,tending to twist or distort the same. However, the horizontal orconnecting leg portion of the member 18 now comes into play, acting intension to prevent distortion of the ends of the arms.

Washers 17 preferably are provided under the insulators to facilitatetheir turning.

The other two insulators C and D are likewise journaled on a skewedU-shaped member 18A mounted to the arms 11 and 12 in the manner of themember 18; and struts 24A are provided and mounted in operative positionin the manner of the struts 24.

We claim:

1. In a transposition bracket, the combination of a supporting baseadapted to be secured to a cross arm and including a pair of arms havingbent-back portions extending above the plane of said base and eachproviding supports for a pair of insulators diagonally opposite ends ofeach arm being bent upwardly whereby each pair of diagonally oppositeinsulators are at difierent respective levels, said portions havingvertically-directed apertures, generally U-shaped bars each havingvertical parallel legs and horizontal bight portions the parallel legsof which are adapted to be inserted vertically through said apertures toextend above said bent-back portions to receive the insulators, theangle between the vertical legs and the horizontal bight portions beinggreater adjacent the higher insulators and less adjacent the lowerinsulators, and a strut having apertured end portions adapted removablyto be attached to said parallel legs above said bent-back portions, saidstrut and the transverse leg of said U-shaped member providingcompression and tension members, respectively, of a structure tending toresist displacement of said parallel legs one toward the other.

2. In combination, a member includin a pair of paral lel arms havingapertured U-shaped end portions forming supports, one end of each ofsaid arms being bent upwardly, each pair of diagonally remote ends ofsaid arms being in the same plane and at a different level than theother diagonally remote pair of arms, a U-shaped member the parallellegs of which extend upwardly through said end portions to project abovethe planes of said supports, a strut having apertured ends through whichsaid parallel legs extend, said ends being supported by said U-shapedend portions, spool insulators rotatable on said parallel legs abovesaid supports each pair of diagonally remote insulators being at adifferent level, and means including pins through the upper portions ofsaid parallel legs removably locking said insulators to said parallellegs and suspending said U-shaped member from said insulators, saidstruts and said U-shaped members References Cited in the file of thispatent UNITED STATES PATENTS Case Mar. 2, 1948 Wheeler et al. Oct. 24,1950

